Brush for dynamo-electric machines.



W. O. FISH. BRUSH FOR DYNAMO ELECTRIC MAGHINES.

APPLICATION FILED SEPT. 11, 1909.

Patented June 27, 1911.

Inventor: Walter-C.F'isb,

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Witnesses:

UNITED STATES PATENT OFFICE..,

WALTER C. FISH, 0F LYNN, MASSACHUSETTS, ASSIGNOR TO GENERAL ELECTRIS COMPANY, A CORPORATION OF NEW YORK.

BRUSH FOR DYNAMO-ELECTRIC MACHINES.

Application filed September 11,1909. Serial No. 517,195.

To all whom "it may concern:

Be it known that I, VALTER C. FIsH, a citizen of the United States, residing at Lynn, county of Essex,,iS.tate of Massachusetts, have invented certain new and useful.

Improvements in Brushes for Dynamo-Electric Machines,- of which the following is a specification.

My invention relates to brushes for dynamo-electric machines and particularly to such brushes having a wearing portion for engaging with the collector surface and a non-wearing portion extending therefrom. The object of my invention is to produce a well. ventilated brush of this type.

It has been found by experiment that a reduction of temperature in the operation of a brushon a dynamo-electric machine results in a marked reduction in the temperature rise in the collector surface, so that by the use of my improved form of brush,'I am enabled not only to minimize the sparking which is caused by irregularities in.-the collector surface, but am also enabled to re duce the temperature at which the brush operates and thereby further improve its oper-' ation.

To this end my invention consists in various improvements hereinafter to be more fully described and claimed.

For a better understanding of my invention reference may be had to the following description taken in connection with the accompanying drawing, in which' I Figure 1 is a perspective View of a brush built in accordance with my invention; Fig. 2 is a sectional view through a brush box and the brush of Fig. 1; Fig. 3 is an elevation of the same brush, with parts of the metal superstructure broken away, and Fig. 4 is a plan View of the same.

Referring to the drawing, 1 is the wearing portion ofmy brush, which is made of carbon or other material and which engages the collector surface; 2 is the superstructure .con-

sisting of a sheet metal cap, open on two of its sides, the top part 3 of whichis engaged by the spring 11 of the brush holder to force it into contact with the collector surface 10. The metal superstructure is preferably made of some metal having a low specific gravity,

Specification of Letters Patent.

Patented J tine 2'7,

such as aluminum, and has the same contour as the wearing portion of the brush, so that it forms a guide for the brush in the brushholder box 9. I have shown it as being U- shaped and riveted to the portion 1 of the brush by means of hollow rivets 5. Radiating vanes 6 are placed in the interior 4 of the metal cap and are fastened thereto by means of rivets 7. A pigtail for connecting the brush to the brush-holder body is fastened to the terminal 8 which is also fas-. te'ned to the top 3 of the metal cap by means of.rivets.

I desire it to be understood that my invention is not limited to the particular construction shown and described, and aim in the appended claims to cover all modifications which do not depart from the spirit and scope of my invention,

What I claim as new and desire to secure by Letters Patentof the United States, is,

l. A brush fora dynamo-electric machine comprising a wearing portion-which engages the collector surface and a sheet metal superstructure of light weight open on two of its sides.

. 2. A brush for a dynamo-electric machine comprising a wearing portion whicn engages the collector surface and a superstructure consisting of a U'shaped metal cap, said cap being open on two of its sides.

3. A brush for a dynamo-electric machine comprising a wearing portion which engages the collector surface, a metal part and radiating vanes fastened to saidmetal part.

4. A brush for a dynamo-electric machine comprising a wearing portion which engages the collector surface, a metal superstructure of light weight and radiating vanes fastened to said superstructure.

5. A brush for a dynamo electric machine comprising a wearing portion which engages the collector surface, a metal superstructure of light weight and radiating vanes in the interior of said superstructure.

6. A brush for a dynamo-electric machine comprising a wearing portion which engages the collector surface, a metal superstructure of light weight and radiating vanes fastened to the interior of said superstructure.

7. A brush for a dynamo-electric machine comprising a Wearing portion which engages Weight and radiating vanes fastened. to the 10 the collector surface, a superstructure conlnterlor of said superstructure. slstlng of a U-shaped metal cap of light In witness whereof, I have hereunto set -weight and radiating vanes in the interior my hand this ninth (lay of September, 1909.

of said' superstructure.

8. A brush for a dynamo-electric machine I comprising a Wearing portion which engages Witnesses: the collector surface, a superstructure con- JoHN A. McMANUs, J12, sisting of a U-shaped metal cap of light CHARLES A. BARNARD.

WALTER C. FISH. 

